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Unanswered: Intermittent connection issues to Oracle 11g

I have some intermittent conneciton issues to an Oracle database. Every 15-20 minutes or so, I get disconnected from the database, and I have to reconnect.

I am connecting to the DB over a VPN connection running between a Sonicwall router and a Cisco VPN concentrator.

It used to work fine, but when we changed office locations and set up the connection again, we immediately began experiencing these connection issues.

I am running Toad for Oracle v10.6.1.3 using Instant Client 11.2.0.1.0 on Windows 7 x64 - Have also tried Aqua Data studio with the integrated oci client, and that gives the same intermittent connection issues.

I am also running a lot of remote desktop connections over the same VPNs, and there are no issues whatsoever with those, so it only applies to the Oracle connection.